Secrets that the Fireflies Hold

This is a story about a group of Sophomore students at a local high school that decide to fulfill their life long dream of visiting Japan, during one of their high school breaks they all chipped in and decided to visit Okinawa, Japan. During their stay they had planned to go sightseeing, enjoy from the local restaurants and clubs but when one of their friends go missing leaving behind only a ambiguous trail of Fireflies that they could hardly decipher; when confronted with the locals in Okinawa they find a startling truth that this was not the first time the Fireflies have taken a victim. What will become of these high school students? Will they be able to overcome this mystery or will they become just another victims to the Fireflies?